Rigid disc substrate comprising a central hard core substrate wi

Details Rigid disc substrate comprising a central hard core substrate wi Rigid disc substrate comprising a central hard core substrate wi

1993-12-02

1996-01-30

Ahmad, Nasser

Stock material or miscellaneous articles

Circular sheet or circular blank

360135, 428 655, 428145, 428149, 428156, 428172, 428219, 428220, 428446, 428450, 428694SG, 428694ST, 428698, 428704, 428900, 428928, B32B 302

Patent

active

054879310

ABSTRACT:
A rigid magnetic memory disc(28) is disclosed having a substantially flat, central hard core substrate(12) and an overlying smoothing layer(14) deposited thereon. The smoothing layer(14) is subsequently polished to a predetermined thickness. The smoothing layer(14) should be capable of having a surface finish better than approximately ten Angstroms Ra. After the smoothing layer(14) is polished, an appropriate magnetic medium(16) and alternately, a nonmagnetic finishing layer(16) are then applied to the rigid disc substrate(10) as necessary, ultimately rendering a finished magnetic disc. The flatness of the underlying central hard core substrate(12) and the flatness and smoothness of the smoothing layer(14), the overlying magnetic medium(16) and the overlying finishing layer(18) allows the read-write head(24) to pass over the magnetic medium(16),or the finishing layer(18), if present, at both a substantially constant and substantially low flying height, thus increasing the areal density of the rigid magnetic memory disc(28). Preferably, the typical flying height of the read-write head(24) is approximately less than two and one-half microinches.

REFERENCES:
patent: 4529659 (1985-07-01), Hoshino
patent: 4598017 (1986-07-01), Bayer
patent: 4738885 (1988-04-01), Matsumoto

Affiliated with

Also associated with

Rating

Rigid disc substrate comprising a central hard core substrate wi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rigid disc substrate comprising a central hard core substrate wi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rigid disc substrate comprising a central hard core substrate wi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-155985